The upper mantle structure of the North Sea region from Rayleigh wave dispersion |
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| Authors: | Graham W Stuart |
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| Institution: | Geology Department, Reading University and MOD(PE), Seismology Unit, Blacknest, Brimpton, Reading |
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| Abstract: | Summary. The phase velocity dispersion of fundamental mode Rayleigh waves (period range 13–127 s) is determined by the interstation method for three profiles that traverse the North Sea region of northwest Europe. The resulting observations have been combined to produce a regional phase velocity curve with 95 per cent confidence intervals, which belongs to the aseismic continental platform category of Knopoff.
Inversions of the regional phase velocity curve by the'Hedgehog'method indicate that the North Sea region is characterized by an upper mantle low-velocity zone of S -wave velocity 4.35–4.45 km/s between depths of approximately 85–200 km. |
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